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xfs: factor out log write ordering from xlog_cil_push_work()

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So we can use it for start record ordering as well as commit record
ordering in future.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Dave Chinner 2021-08-10 18:00:43 -07:00 committed by Darrick J. Wong
parent c45aba40cf
commit bf034bc827
1 changed files with 51 additions and 36 deletions
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87
fs/xfs/xfs_log_cil.c
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@ -656,9 +656,54 @@ xlog_cil_set_ctx_write_state(
/*
* Write out the commit record of a checkpoint transaction associated with the
* given ticket to close off a running log write. Return the lsn of the commit
* record.
* Ensure that the order of log writes follows checkpoint sequence order. This
* relies on the context LSN being zero until the log write has guaranteed the
* LSN that the log write will start at via xlog_state_get_iclog_space().
*/
static int
xlog_cil_order_write(
struct xfs_cil *cil,
xfs_csn_t sequence)
{
struct xfs_cil_ctx *ctx;
restart:
spin_lock(&cil->xc_push_lock);
list_for_each_entry(ctx, &cil->xc_committing, committing) {
/*
* Avoid getting stuck in this loop because we were woken by the
* shutdown, but then went back to sleep once already in the
* shutdown state.
*/
if (xlog_is_shutdown(cil->xc_log)) {
spin_unlock(&cil->xc_push_lock);
return -EIO;
}
/*
* Higher sequences will wait for this one so skip them.
* Don't wait for our own sequence, either.
*/
if (ctx->sequence >= sequence)
continue;
if (!ctx->commit_lsn) {
/*
* It is still being pushed! Wait for the push to
* complete, then start again from the beginning.
*/
xlog_wait(&cil->xc_commit_wait, &cil->xc_push_lock);
goto restart;
}
}
spin_unlock(&cil->xc_push_lock);
return 0;
}
/*
* Write out the commit record of a checkpoint transaction to close off a
* running log write. These commit records are strictly ordered in ascending CIL
* sequence order so that log recovery will always replay the checkpoints in the
* correct order.
*/
static int
xlog_cil_write_commit_record(
@ -904,39 +949,9 @@ xlog_cil_push_work(
if (error)
goto out_abort_free_ticket;
/*
* now that we've written the checkpoint into the log, strictly
* order the commit records so replay will get them in the right order.
*/
restart:
spin_lock(&cil->xc_push_lock);
list_for_each_entry(new_ctx, &cil->xc_committing, committing) {
/*
* Avoid getting stuck in this loop because we were woken by the
* shutdown, but then went back to sleep once already in the
* shutdown state.
*/
if (xlog_is_shutdown(log)) {
spin_unlock(&cil->xc_push_lock);
goto out_abort_free_ticket;
}
/*
* Higher sequences will wait for this one so skip them.
* Don't wait for our own sequence, either.
*/
if (new_ctx->sequence >= ctx->sequence)
continue;
if (!new_ctx->commit_lsn) {
/*
* It is still being pushed! Wait for the push to
* complete, then start again from the beginning.
*/
xlog_wait(&cil->xc_commit_wait, &cil->xc_push_lock);
goto restart;
}
}
spin_unlock(&cil->xc_push_lock);
error = xlog_cil_order_write(ctx->cil, ctx->sequence);
if (error)
goto out_abort_free_ticket;
error = xlog_cil_write_commit_record(ctx, &commit_iclog);
if (error)